64320400

素因数分解:

$2^4\times 5^2\times {\mathrm{401}}^2$

素因数の和:820

約数の個数: 45

約数和(自身を含む): 154916083

約数和(自身を除く): 90595683

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400, 401, 802, 1604, 2005, 3208, 4010, 6416, 8020, 10025, 16040, 20050, 32080, 40100, 80200, 160400, 160801, 321602, 643204, 804005, 1286408, 1608010, 2572816, 3216020, 4020025, 6432040, 8040050, 12864080, 16080100, 32160200, 64320400]

約数ペア:

[(1, 64320400), (2, 32160200), (4, 16080100), (5, 12864080), (8, 8040050), (10, 6432040), (16, 4020025), (20, 3216020), (25, 2572816), (40, 1608010), (50, 1286408), (80, 804005), (100, 643204), (200, 321602), (400, 160801), (401, 160400), (802, 80200), (1604, 40100), (2005, 32080), (3208, 20050), (4010, 16040), (6416, 10025)]